Green’s Dictionary of Slang

(Aus.) a meal of sandwiches; thus cut lunch commando n., a regular employee, i.e. one who takes sandwiches to work; also attrib.

1952		T.A.G. Hungerford Ridge and River (1966) 123: Think I got nothin’ to do but wait around for a bunch of cut-lunch commandos.
1953		Baker Aus. Speaks.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 23: Cut Lunch Commando Regular employee.
1991		M.B. ‘Chopper’ Read Chopper From The Inside 31: We would be better off with a cut lunch and a nine to five.
1997		Hansard (Queensland) 21 Nov. 4631/2: They are tired of people running around having cut lunch commando courses with touchy-feeling stuff about transforming the culture.
2001		A. Pike River to Cross 42: This bloke, with all his talk about what he did in the war [...] bit of a cut-lunch commando, if you ask me; could’ve had some sort of a base job.
2002		T. Tourers (N. Launceston, Tas.) 8 Dec. 🌐 It was also a chance for the non cut lunch Commandos to buy something for lunch as the Café at Blue lake was closed.